Single 44 Carburetor Kit, HPMX By EMPI

OVERVIEW

When you are looking to bridge the gap between a sluggish stock setup and the complexity of a dual-carburetor configuration, the EMPI Single 44 HPMX Carburetor Kit stands as the definitive solution for the air-cooled enthusiast. This kit is specifically engineered for those who demand a significant boost in throttle response and top-end power without the synchronization headaches often associated with dual-carb systems. By utilizing a high-performance 44mm HPMX carburetor mounted on a precision-cast aluminum center-section intake manifold, this setup provides superior fuel atomization and air distribution to your dual-port heads. Whether you are running a stout 1776cc or a high-revving 2110cc engine, the 44 HPMX offers the airflow capacity necessary to unlock your engine''s true potential while maintaining the ease of a single-carburetor adjustment point.

Precision and durability are at the heart of this EMPI kit. The HPMX series is world-renowned for its compatibility with Weber IDF components, meaning you have access to a vast array of jets, emulsions tubes, and venturis to fine-tune your air-fuel mixture to perfection. This kit doesn''t just stop at the carburetor; it includes a heavy-duty, aircraft-style heim joint linkage that ensures smooth, bind-free throttle operation throughout the entire RPM range. Complementing the performance is a high-shine chrome air cleaner assembly with a high-flow element, providing both aesthetic appeal and engine protection. This is a comprehensive package designed for the Volkswagen owner who wants a "set it and forget it" performance upgrade that looks as good as it performs under the decklid.

FITMENT

This kit is designed for Type 1 Air-Cooled VW Engines with Dual-Port Cylinder Heads. Please note that modifications may be required for vehicles with specialized engine tins or converted fuel-injection systems.

• VW Beetle (Sedan & Convertible): 1971-1977 (Dual Port)
• VW Karmann Ghia: 1971-1974 (Dual Port)
• VW Super Beetle: 1971-1979
• VW Thing (Type 181): 1973-1974
• VW Bus / Transporter (Type 2 with Upright Engine): 1971
• Custom Applications: Any VW-based sand rail, buggy, or trike utilizing an upright Type 1 dual-port engine.

SPECS

• Carburetor Model: EMPI 44 HPMX (Single Configuration)
• Intake Manifold: Cast Aluminum Center Mount for Dual-Port Heads
• Linkage Type: Heavy-Duty Aircraft-Style Heim Joint Linkage
• Air Cleaner: Chrome-Plated Steel with High-Flow Gauze Element
• Jetting Compatibility: Fully compatible with Weber IDF series jets and internal components
• Venturi Size: 36mm (Standard)
• Fuel Inlet: Standard barbed fitting for 1/4 inch or 5mm fuel line
• Included Hardware: Base gaskets, manifold boots, clamps, and necessary mounting hardware
• Finish: Natural aluminum manifold with chrome accents on the air cleaner

PRO TIPS

1. Manage Your Manifold Heat

Single center-mount carburetors are notoriously prone to "icing" or fuel puddling in the long intake runners, especially in cooler climates or during high-humidity days. To prevent flat spots and ensure smooth idling, always ensure your exhaust system is equipped with functional heat riser tubes. Connecting these to the intake manifold allows hot exhaust gases to circulate under the carb, keeping the fuel in a vaporized state. If you are running an aftermarket "merging" header without heat riser flanges, you may need to fabricate a solution or be prepared for longer warm-up times.

2. Regulate Your Fuel Pressure

The EMPI HPMX, much like the Weber IDF it is based on, is highly sensitive to fuel pressure. Stock VW mechanical fuel pumps can sometimes spike in pressure, and most modern electric pumps output far too much for these needle and seat assemblies to handle. We strongly recommend installing a high-quality fuel pressure regulator set to exactly 3.0 to 3.5 PSI. Running anything higher than 4.0 PSI can overwhelm the float bowl, leading to flooding, poor fuel economy, and potential engine fire hazards.

3. Fine-Tune for Your Displacement

While this kit comes with a standard baseline jetting, it is rarely "plug-and-play" for every engine size. A 1600cc engine and a 2110cc engine have vastly different vacuum signals and airflow requirements. After the initial installation and break-in, perform a "plug chop" or use a wideband O2 sensor to check your air-fuel ratios. Don''t be afraid to swap out the main jets or air correctors to eliminate any hesitation during the transition from the idle circuit to the high-speed circuit. Since this carb uses Weber IDF jets, tuning parts are readily available and easy to swap through the top of the carburetor.